Reset widget on manual exit as well.

ultrasonic/src/main/kotlin/org/moire/ultrasonic/activity/NavigationActivity.kt

@@ -380,6 +380,10 @@ class NavigationActivity : AppCompatActivity() {
 
     private fun exit() {
         Timber.d("User choose to exit the app")
+
+        // Broadcast that the service is being shutdown
+        RxBus.stopCommandPublisher.onNext(Unit)
+
         lifecycleSupport.onDestroy()
         finishAndRemoveTask()
     }

ultrasonic/src/main/kotlin/org/moire/ultrasonic/service/RxBus.kt

@@ -68,7 +68,6 @@ class RxBus {
             PublishSubject.create()
         val stopCommandObservable: Observable<Unit> =
             stopCommandPublisher.observeOn(mainThread())
-
     }
 
     data class StateWithTrack(